F**k, a HeisenBug (try to observe him, he vanishes...)
I put the V188.8.131.52 back into Modules, but everything is ok with ShortAircraftNameOk (sigh).
The only thing that changed since then is the A2A Core Accu-Sim DLL, I updated from Core Accu-Sim v.1.3.1 to Core Accu-Sim v.1.4 (just for the record)
I attached my (zipped) FSUIPC.ini but I don't see much sense in investigating this further, as I said, a HeisenBug. When such a thing happens again, I know what info you need and will collect it. Until then we should close the case and I go on with V 184.108.40.206.
Nevertheless, I switched the console window on for the second try, maybe something interesting for you...
Console Started ...
********* FSUIPC4, Version 4.834 by Pete Dowson *********
FSUIPC4 Key is provided
WIDEFS7 not user registered, or expired
Running inside FSX on Windows 7
203 System time = 11/06/2012 20:43:57
203 FLT path = "C:\Users\XXXX\Documents\Flight Simulator X-Dateien\"
219 Trying to connect to SimConnect Acc/SP2 Oct07 ...
266 FS path = "G:\Flight Simulators\FSX\"
531 LogOptions=00000000 00000001
531 Wind smoothing fix is fully installed
531 G3D.DLL fix attempt installed ok
531 SimConnect_Open succeeded: waiting to check version okay
531 Trying to use SimConnect Acc/SP2 Oct07
6459 Running in "Microsoft Flight Simulator X", Version: 10.0.61637.0 (SimConnect: 10.0.61259.0)
6459 Initialising SimConnect data requests now
6459 FSUIPC Menu entry added
6490 C:\Users\XXXXX\Documents\Flight Simulator X-Dateien\Cessna in Egelsbach.FLT
6490 G:\Flight Simulators\FSX\SimObjects\Airplanes\C172\Cessna172SP.AIR
17145 Weather Mode now = Custom
17145 c:\users\XXXX\documents\flight simulator x-dateien\_Fall City 1WA6.FLT
80107 System time = 11/06/2012 20:45:17, Simulator time = 08:48:56 (15:48Z)
80138 Aircraft="Cessna Skyhawk 172SP Paint1"
82041 Starting everything now ...
83305 Advanced Weather Interface Enabled
162663 G:\Flight Simulators\FSX\SimObjects\Airplanes\WoP3_P51D\p51d.AIR
163084 Aircraft="P-51D 'McSwine'"
Error, no table returned
197030 Sim stopped: average frame rate for last 34 secs = 30.7 fps